books.google.com - Includes Part 1, Number 1: Books and Pamphlets, Including Serials and Contributions to Periodicals (January - June)...https://books.google.com/books/about/Catalog_of_Copyright_Entries_Third_Serie.html?id=ZB0hAQAAIAAJ&utm_source=gb-gplus-shareCatalog of Copyright Entries. Third Series